so i got the new campaign camos ( pixel-camo: summer, winter, desert ) and i aplied them to a verhicle i was grinding atm ... i finished the grind, removed the camo, bought the next tank in the line and wanted to apply the camo again like you can do with other camos ... somehow i can not do that ... the camo is now locked to my tier 9 patton

Nope, Micro patch few days ago where WG patched it so CW camo's are locked to tanks once again. When the new customisation first came in you could. But obviously something like this thats useful and helpful for the player and a nice new feature, cannot stay as it is! Its WG after all! its their job to screw over as many people as they can so they 'fixed' it. And of course didn't say a word to anyone leaving many people putting camo on tanks thinking they could move it after. \o/